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Texas Instruments TI-1800

Date of introduction:  1997 Display technology:  LCD
New price:   Display size:  10
Size:  5.7" x 4.3" x 0.8"    
Weight:  3.9 ounces Serial No:  132693
Batteries:  1*LR54 (30A) Date of manufacture:  mth 07 year 1997
AC-Adapter:   Origin of manufacture:  China
Precision:  10 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Otto Herzig

The TI-1800 is a very useful calculator with a large and bright display. The size is boarderline to the pocket calculators. Compare it with the cheaper TI-1795+.

TI-1800_PCB.jpg (66963 Byte)The internal construction of the TI-1800 uses a clever approach with two different types of printed circuit boards (PCB's). With such a calculator you find always two requirements for the PCB: 

bulletKeyboard: 
Simple technology and big area
bulletCalculating electronics and display connection: 
Expensive technology and small area.

Most designers try to avoid different technologies inside a product and have to decide for an expensive technology AND big area. Engineers responsible for the TI-1800 tried another way and used the display connection methode even for the keyboard connection resulting in a very cheap solution.



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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, December 5, 2001. No reprints without written permission.